IMO Icelantic Nomad 95s are underrated. I ride the Da Nollie (same as the 95, just a previous name) and Im 5'9-5'10 and 130-135 and they are easy as hell to flex on. Butters are no issue. I wouldn't say they flex out on you backseat, but there is a limit before you wishy-washy, same with really any other soft ski. Id also recommend these
Nomad 95 / Da Nollie
ON3P Magnus
Moment Vice (Somewhat stiff but due to so much rocker I felt they were just as easy to swerve on as the Nomad and Magnus)
^ I have personal experience on all 3 so shoot met questions if you have any
By hand flex and reviews Id also recommend these
Armada Edollo or B Dog
Vishnu Wet
Faction 2.0
Line Blend or Honey Badger (Id be concerned with durability issues on these though)